221617379 has 2 divisors, whose sum is σ = 221617380. Its totient is φ = 221617378.

The previous prime is 221617373. The next prime is 221617411. The reversal of 221617379 is 973716122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221617379 is a prime.

It is a super-2 number, since 2×221617379² = 98228525349659282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221617373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110808689 + 110808690.

It is an arithmetic number, because the mean of its divisors is an integer number (110808690).

Almost surely, 2^221617379 is an apocalyptic number.

221617379 is a deficient number, since it is larger than the sum of its proper divisors (1).

221617379 is an equidigital number, since it uses as much as digits as its factorization.

221617379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The square root of 221617379 is about 14886.8189684701. The cubic root of 221617379 is about 605.1568284097.

The spelling of 221617379 in words is "two hundred twenty-one million, six hundred seventeen thousand, three hundred seventy-nine".